• Localizing quantum phase slips in one-dimensional Josephson junction chains 

      Ergül, Adem; Lidmar, Jack; Johansson, Jan; Azizoǧlu, Yaǧiz; Schaeffer, David; Haviland, David B. (Journal article; Peer reviewed, 2013)
      We studied quantum phase-slip (QPS) phenomena in long one-dimensional Josephson junction series arrays with tunable Josephson coupling. These chains were fabricated with as many as 2888 junctions, where one sample had a ...
    • Phase sticking in one-dimensional Josephson junction chains 

      Ergül, Adem; Schaeffer, David; Lindblom, Magnus; Haviland, David B.; Lidmar, Jack; Johansson, Jan (Journal article; Peer reviewed, 2013)
      We studied current-voltage characteristics of long one-dimensional Josephson junction chains with Josephson energy much larger than charging energy, EJ EC. In this regime, typical I-V curves of the samples consist of a ...
    • Spin transport in ferromagnetic/normal-metal tunnel junction arrays 

      Johansson, Jan (Journal article; Peer reviewed, 2012)
      An array of alternating ferromagnetic and normal-metal islands separated by small tunnel junctions is theoretically investigated in the sequential tunneling regime. A numerical Monte Carlo method is used to calculate the ...